A 26-year-old grandson of late-New York Giants co-owner Wellington Mara was arrested Tuesday morning for allegedly setting a motorcycle ablaze near his home in Manhattan, a law-enforcement official said.

Stephen Mara — the nephew of John Mara, the current president and CEO of the franchise — was arrested for arson after he allegedly used debris from the street and a lighter to ignite a motorcycle near the 69th Regiment Armory on East 26th Street, around the corner from his home. The resulting blaze allegedly damaged the bike and a nearby building at 88 Lexington Ave., the official said.

The arrest and subsequent investigation led police to determine that Mr. Mara allegedly set fire to three vehicles during an incident on Oct. 31, when three vehicles were set on fire around the same location, the official said.

Charges were pending, the official said.

Mr. Mara was in police custody and could not be reached for comment. It was unclear if he had retained a lawyer. Giants spokesman Pat Hanlon said the team had no comment.

Tuesday’s incident occurred shortly after 3 a.m. A security guard at the armory told police that he saw Mr. Mara ignite the motorcycle, the official said. The guard also told police that he recognized Mr. Mara as a person who had allegedly done the same thing to two cars and another motorcycle on Oct. 31, the official said.

The guard held Mr. Mara until New York Police Department officers arrived, the official said.

The alleged Oct. 31 incident was originally reported as a motor vehicle accident, the official said.